reiver
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go-eol
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lf cr

master
Charles Iliya Krempeaux 2024-02-18 10:07:49 -08:00
parent 00cd6c6917
commit 0c561bbb23
2 changed files with 265 additions and 0 deletions
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50
readlfcr.go 100644
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package eol
import (
"io"
"sourcecode.social/reiver/go-opt"
"sourcecode.social/reiver/go-eol/cr"
"sourcecode.social/reiver/go-eol/lf"
"sourcecode.social/reiver/go-eol/lfcr"
)
// ReadLFCR tries to read the "\r\n" (i.e., carriage-return line-feed) end-of-line sequence.
//
// If successful, it returns the number-of-bytes read (to read in end-of-line sequence "\r\n").
//
// If the first character read is not a '\n', then ReadLFCR will try to unread the character.
// If the second character read is not a '\r', then ReadLFCR will also try to unread the second character, but will not be able to unread the first character (i.e., '\n') it already read.
//
// Example usage:
//
// size, err := eol.ReadLFCR(runescanner)
func ReadLFCR(runescanner io.RuneScanner) (size int, err error) {
var size0 int
{
var err error
const characterNumber uint64 = 1
var circumstance internalCircumstance = specifyCircumstance(opt.Something(lfcr.String), characterNumber)
size0, err = readthisrune(circumstance, runescanner, lf.Rune)
if nil != err {
return size0, err
}
}
var size1 int
{
var err error
const characterNumber uint64 = 2
var circumstance internalCircumstance = specifyCircumstance(opt.Something(lfcr.String), characterNumber)
size1, err = readthisrune(circumstance, runescanner, cr.Rune)
if nil != err {
return size1+size0, err
}
}
return size1+size0, nil
}

215
readlfcr_test.go 100644
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package eol_test
import (
"testing"
"io"
"strings"
"sourcecode.social/reiver/go-utf8"
"sourcecode.social/reiver/go-eol"
)
func TestReadLFCR(t *testing.T) {
tests := []struct{
Value string
ExpectedSize int
}{
{
Value: "\n\r",
ExpectedSize: 2,
},
{
Value: "\n\rapple banana cherry",
ExpectedSize: 2,
},
}
for testNumber, test := range tests {
var reader io.Reader = strings.NewReader(test.Value)
var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
actualSize, err := eol.ReadLFCR(runescanner)
if nil != err {
t.Errorf("For test #%d, did not expect an error but actually got one.", testNumber)
t.Logf("ERROR: (%T) %s", err, err)
t.Logf("VALUE: %q", test.Value)
continue
}
{
expected := test.ExpectedSize
actual := actualSize
if expected != actual {
t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
t.Logf("EXPECTED: %d", expected)
t.Logf("ACTUAL: %d", actual)
t.Logf("VALUE: %q", test.Value)
continue
}
}
}
}
func TestReadLFCR_fail(t *testing.T) {
tests := []struct{
Value string
ExpectedError string
ExpectedSize int
}{
{
Value: "",
ExpectedError: `eol: problem reading character №1 of end-of-line sequence "\n\r": EOF`,
},
{
Value: "\r",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\r' (U+000D)`,
},
{
Value: "\n",
ExpectedError: `eol: problem reading character №2 of end-of-line sequence "\n\r": EOF`,
ExpectedSize: 1,
},
{
Value: "\u0085",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u0085' (U+0085)`,
},
{
Value: "\u2028",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u2028' (U+2028)`,
},
{
Value: "😈",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '😈' (U+1F608)`,
},
{
Value: "\rapple banana cherry",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\r' (U+000D)`,
},
{
Value: "\u0085apple banana cherry",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u0085' (U+0085)`,
},
{
Value: "\u2028apple banana cherry",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '\u2028' (U+2028)`,
},
{
Value: "😈apple banana cherry",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '😈' (U+1F608)`,
},
{
Value: " \r",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
},
{
Value: " \n",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
},
{
Value: " \u0085",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
},
{
Value: " \u2028",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
},
{
Value: " 😈",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found ' ' (U+0020)`,
},
{
Value: ".\n",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
},
{
Value: ".\r",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
},
{
Value: ".\u0085",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
},
{
Value: ".\u2028",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
},
{
Value: ".😈",
ExpectedError: `eol: line-feed (LF) character ('\n') (U+000A) not found for end-of-line sequence "\n\r" character №1 — instead found '.' (U+002E)`,
},
}
for testNumber, test := range tests {
var reader io.Reader = strings.NewReader(test.Value)
var runescanner io.RuneScanner = utf8.NewRuneScanner(reader)
actualSize, err := eol.ReadLFCR(runescanner)
if nil == err {
t.Errorf("For test #%d, expected an error but did not actually get one.", testNumber)
t.Logf("EXPECTED-ERROR: %q", test.ExpectedError)
t.Logf("VALUE: %q", test.Value)
continue
}
{
expected := test.ExpectedError
actual := err.Error()
if expected != actual {
t.Errorf("For test #%d, the actual error is not what was expected.", testNumber)
t.Logf("EXPECTED: %q", expected)
t.Logf("ACTUAL: %q", actual)
t.Logf("VALUE: %q", test.Value)
continue
}
}
{
expected := test.ExpectedSize
actual := actualSize
if expected != actual {
t.Errorf("For test #%d, the actual size is not what was expected.", testNumber)
t.Logf("EXPECTED: %d", expected)
t.Logf("ACTUAL: %d", actual)
t.Logf("VALUE: %q", test.Value)
continue
}
}
}
}